Spring structure



June H, 1935; F. J. HRUZA $004,697 SPRING STRUCTURE Filed April 16, 1934Patented June 11, 1935 UNITED STATES PATENT OFFICE SPRING STRUCTUREFrank J. Hruza, Cicero, 111. Application April 16, 1934, SerialN0.'720,906

2 Claims.

rat-tails to form the complete spring structure.

The primary object of the invention is to provide an improved springstructure unit wherein springs are interconnected in spaced relation byconnecting the end portions of the wires which form openend-convolutions of the individual spring coils.

A further object of the invention is to provide connections betweenpairs of coil springs by interlocking the corresponding connectingportions of each pair.

Heretofore it has been the practice to connect two rows of individualcoil springs by means of helical connectors. By employing the presentinvention only half as many helical connectors are needed to assemblethe units which usually comprise four springs each.

It has also been heretofore proposed to form adjacent spring coils froma single wire which connects a series of coils alternately at the topand bottom. In the present invention the coil springs have openend-convolutions and it is not necessary to connect the end portion ofthe Wire to the coil itself to form a ring, but by interconnecting theend sections of several springs the end portions all meet at a cross inthe center of the unit. The connections can readily be made by hand ormachine.

With the present construction each of the springs is held firmly inproper spaced relation to its companion springs and the completedassembly is yielding, durable, and noiseless in use.

The invention is illustrated in a preferred embodiment in theaccompanying drawing in which Fig. l is a plan view of a springstructure unit embodying the present invention; Fig. 2 is an elevationalview of a single spiral wound upholstery spring of the character used inFig. 1; Fig. 3 is a broken detail sectional view of the interlockingconnection between the pairs of springs, taken as indicated in line 3 ofFig. 1; and Fig. 4 is a broken plan view of a modification showing aclip connecting the end portions of the springs.

In the embodiment illustrated in Figs. 1-3 a coil spring 5 is providedby spirally winding a steel wire in a manner well understood in the-art.The spring is provided at the top and bottom with open end-convolutions6 and the wire which forms the spring has an extending end-portion 1which is used to make a connection with the wire forming a correspondingend-convolution of a companion spring. Preferably, theextreme-end-portion of the wire is wrapped once or twice about thecompanion wire as indicated at 8. As shown in Fig. 3 a space Il may beprovided between the connecting portions of the wires '1 of the pair ofsprings 5 and the connecting portions of a companion pair of springs 9may be interlocked thereto by having one of the wires I pass through theopening ll. Of course, the end portions of the wires ID are also wrappedabout each other as indicated at l2. The interlocking connection betweenthe pairs may be snug if desired or it may be somewhat loose to permitslight movement between the pairs of springs.

In the modification shown in Fig. 4 it will be understood that fourspring coils may be arranged in the same manner as shown in Fig. 1 butinstead of wrapping the end portions of the wires about each other theyare placed in juxtaposition in the form of a cross and securely grippedtogether by means'of a suitable clip l whose arms l6 may be curledunderthe wires and crimped, in position.

The foregoing detailed description is given for clearness ofunderstanding, and no unnecessary limitations should be understoodtherefrom, but the appended claims should be construed as broadly aspermissible in view of the prior art.

I claim:

1. A spring structure unit comprising: four.

wire upholstery springs having end-convolutions arranged injuxtaposition, the top-convolutions of each spring being connected tothe top-convolutions of the companionvsprings at a common centraljunction point and held in interlocked relation at said junction bymeans of the wires which form the top end-convolutions so as to providea substantially fiat resilient top-face for, the unit, and thebottom-convolutions of each spring being similarly connected at a commoncentral junction point and held in interlockedrelation by means of thewires which form the bottom end-convolutions to provide a substantiallyflat resilient bottom-face for said unit, the ends of said wires lyingadjacent to one or the other of said junction points.

2. A spring structure unit comprising: four wire upholstery springshaving open end-convolutions arranged in square juxtaposition, theend-portions of the wires of one pair of diagonally opposed topend-convolutions being spliced together at a top central junction pointto form a resilient connection and the end-portions of the wires of theother pair of opposed top'end-convolutions being spliced together inlike manner and interlocked with the connection of the first pair atsaid junction point, and the bottom endconvolutions of said springsbeing spliced and interlocked with each other at a bottom centraljunction point in like manner.

FRANK HRUZA.

